What is essential for ensuring the proper functionality of multiple valves connected to an irrigation system?

A well-setup common wire is essential for ensuring the proper functionality of multiple valves connected to an irrigation system because it serves as a return pathway for the electrical signal sent from the controller to the valves. In an irrigation system, valves are typically activated by electric signals, and a reliable common wire ensures that these signals can travel effectively to each valve.

When multiple valves are in use, they often share a common wire, which allows them to be controlled simultaneously. If the common wire is not properly set up or becomes damaged, it can lead to incomplete signals reaching the valves, resulting in erratic operations or complete failure of some valves to open or close as intended. This can disrupt the irrigation schedule, leading to uneven watering or inefficient water use.

In contrast, while a continuous power source is vital for the controller itself to function, it does not directly impact the connection and operation of the valves. Maximum valve count may play a role in system design but does not address the operational connectivity between valves. A surge protector is essential for safeguarding the system against power spikes but does not affect the day-to-day functionality of the valves themselves. Thus, establishing a well-setup common wire is critical for the successful operation of an irrigation system with multiple valves.